make_transparent: transform low brightness and low transparency to full...

Description Usage Arguments

View source: R/trim_transparency.R

Description

transform low brightness and low transparency to full transparency

Usage

1
2
make_transparent(img, alpha_treshold = 0, brightness_treshold = 1,
  reverse = FALSE)

Arguments

img

raster object

alpha_treshold

pixels with alpha under this value will have it set to 0

brightness_treshold

pixels with brightness over this value will have alpha set to 0

reverse

if reverse is true the darker pixels will have alpha set to 0


moodymudskipper/tweak documentation built on Dec. 5, 2017, 12:33 a.m.